HADOOP-18612. Avoid mixing canonical and non-canonical when performing comparisons (#5339)

Contributed by Steve Vaughan Jr

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/fs/TestFileUtil.java

@@ -1321,16 +1321,16 @@ public class TestFileUtil {
         if (wildcardPath.equals(classPath)) {
           // add wildcard matches
           for (File wildcardMatch: wildcardMatches) {
-            expectedClassPaths.add(wildcardMatch.toURI().toURL()
+            expectedClassPaths.add(wildcardMatch.getCanonicalFile().toURI().toURL()
               .toExternalForm());
           }
         } else {
           File fileCp = null;
           if(!new Path(classPath).isAbsolute()) {
-            fileCp = new File(tmp, classPath);
+            fileCp = new File(tmp, classPath).getCanonicalFile();
           }
           else {
-            fileCp = new File(classPath);
+            fileCp = new File(classPath).getCanonicalFile();
           }
           if (nonExistentSubdir.equals(classPath)) {
             // expect to maintain trailing path separator if present in input, even
@@ -1385,7 +1385,8 @@ public class TestFileUtil {
     for (Path jar: jars) {
       URL url = jar.toUri().toURL();
       assertTrue("the jar should match either of the jars",
-          url.equals(jar1.toURI().toURL()) || url.equals(jar2.toURI().toURL()));
+          url.equals(jar1.getCanonicalFile().toURI().toURL()) ||
+          url.equals(jar2.getCanonicalFile().toURI().toURL()));
     }
   }